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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_functiontypes.introduction"></a><a class="link" href="introduction.html" title="Introduction">Introduction</a>
</h2></div></div></div>
<p>
      Boost.FunctionTypes provides functionality to classify, decompose and synthesize
      function, function pointer, function reference and pointer to member types.
    </p>
<p>
      We collectively refer to these types as <span class="emphasis"><em>callable builtin</em></span>
      types.
    </p>
<p>
      In particular, the library can be used to:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
          test whether a type is a specific callable, builtin type,
        </li>
<li class="listitem">
          extract all component properties from callable, builtin types, and
        </li>
<li class="listitem">
          create callable, builtin types from specified properties.
        </li>
</ul></div>
<p>
      The library is designed to work well with other Boost libraries and uses well-accepted
      concepts introduced by Boost and TR1.
    </p>
<p>
      Templates that encapsulate boolean or numeric properties define a static member
      constant called <code class="literal">value</code>.
    </p>
<pre class="programlisting"><a class="link" href="reference/classification.html#boost_functiontypes.reference.classification.is_function_pointer" title="is_function_pointer">is_function_pointer</a><span class="special">&lt;</span> <span class="keyword">bool</span><span class="special">(*)(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="comment">// == true 
</span>
<a class="link" href="reference/decomposition.html#boost_functiontypes.reference.decomposition.function_arity" title="function_arity">function_arity</a><span class="special">&lt;</span> <span class="keyword">bool</span><span class="special">(*)(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">&gt;::</span><span class="identifier">value</span> <span class="comment">// == 1
</span></pre>
<p>
      Templates that encapsulate properties that are single types contain a type
      member called <code class="literal">type</code>.
    </p>
<pre class="programlisting"><a class="link" href="reference/synthesis.html#boost_functiontypes.reference.synthesis.function_type" title="function_type">function_type</a><span class="special">&lt;</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="keyword">bool</span><span class="special">,</span><span class="keyword">int</span><span class="special">&gt;</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="comment">// is bool(int)
</span>
<a class="link" href="reference/decomposition.html#boost_functiontypes.reference.decomposition.result_type" title="result_type">result_type</a><span class="special">&lt;</span> <span class="keyword">bool</span><span class="special">(&amp;)(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">&gt;::</span><span class="identifier">type</span> <span class="comment">// is bool
</span></pre>
<p>
      Templates that encapsulate properties that are type lists model an MPL-compatible
      type sequence.
    </p>
<pre class="programlisting"><a class="link" href="reference/decomposition.html#boost_functiontypes.reference.decomposition.parameter_types" title="parameter_types">parameter_types</a><span class="special">&lt;</span> <span class="keyword">bool</span><span class="special">(</span><span class="keyword">int</span><span class="special">)</span> <span class="special">&gt;</span> <span class="comment">// models an MPL sequence
</span></pre>
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      Schwinger<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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